F436 Structural Flat Washer (Zinc / Yellow Cr+6) for High-Strength Bolting
The F436 Structural Flat Washer with Zinc and Yellow Cr+6 plating is engineered to meet the strict performance requirements of ASTM F436 for structural steel connections. Designed for use with high-strength bolts, these washers provide superior load distribution, surface protection, and long-term durability in demanding structural and industrial applications.
Material and Protective Coating
Carbon Steel Construction
F436 washers are typically manufactured from heat-treated carbon steel to achieve the mechanical properties required for structural fastening. The hardened construction ensures resistance to deformation, crushing, and embedding under high clamping forces.
Zinc Plating with Yellow Chromate (Cr+6)
Each washer is zinc plated for corrosion resistance, then treated with a Yellow Chromate (Chromium VI) conversion coating. This dual-layer finish enhances protection against moisture, salt exposure, and chemical environments. The yellow-gold appearance also serves as a visual indicator of added corrosion protection.
Dimensional Specifications and Tolerances
Standard Sizes
F436 structural washers are available in nominal bolt sizes such as 1/4", 5/16", 3/8", 1/2", 5/8", 3/4", and 1". The outside diameter (OD) is typically 1.5 to 2 times the inner diameter (ID), ensuring optimal load distribution across steel surfaces.
Precision Manufacturing
These washers are produced with controlled tolerances to ensure proper bolt alignment and structural integrity. Typical tolerances include controlled thickness, OD, and ID ranges to maintain consistent performance in steel-to-steel assemblies.
Mechanical Properties and Performance
High Strength and Load Resistance
F436 washers are engineered to withstand high tensile and yield stresses common in structural bolting. Their hardened design prevents distortion under preload conditions, maintaining clamping force in critical connections.
Standards Compliance and Applications
ASTM and Structural Use
Fully compliant with ASTM F436, these washers are commonly paired with ASTM A325 and A490 structural bolts. Applications include bridges, commercial buildings, heavy equipment, wind towers, and infrastructure projects where code compliance and performance are essential.
For reliable, corrosion-resistant structural fastening, F436 Zinc / Yellow Cr+6 structural flat washers deliver the strength and protection required in heavy-duty steel assemblies.